Features: 2.5 inch large screen with automatic backlight for crystal clear viewing. 4 satellite system support for faster locating and more reliable data transfer. Speed, cadence, heart rate, and power meter sensor compatibility by ANT+ / BT4.0. Cycling data can be sync and shared on App: 37 data and 14 analysis charts. 30 customized pages for better user experience. Built-in 1000mAh rechargeable battery with long working time up to 30 hours. Attention: The GPS position speed takes 30 seconds normally, but the first time positioning will take 90 seconds, and the positioning speed also depends on the weather and other conditions.